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PDF MM5450 Data sheet ( Hoja de datos )
| Número de pieza | MM5450 | |
| Descripción | LED Display Driver | |
| Fabricantes | Microchip | |
| Logotipo |  |
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MM5450/51
LED Display Driver
Features
• Continuous Brightness Control
• Serial Data Input
• No Load Signal Requirement
• Enable (MM5450 Only)
• Wide Power Supply Operation
• TTL Compatibility
• 34 or 35 Outputs, 15 mA Capability
• Alphanumeric Capability
Applications
• Industrial Control Indicator
• Relay Driver
• Digital Clock, Thermometer, Counter, Voltmeter
• Instrumentation Readouts
General Description
The MM5450 and MM5451 LED display drivers are
monolithic MOS IC’s fabricated in an N-Channel,
metal-gate process. The technology produces
low-threshold, enhancement-mode, and ion-implanted
depletion-mode devices.
A single pin controls the LED display brightness by
setting a reference current through a variable resistor
connected to the supply.
Block Diagram
BRIGHTNESS
CONTROL
OUT 34
VDD
20 24
OUT 1
18
19
35 OUTPUT BUFFERS
DATA ENABLE/OUT 35
(See Note 1)
SERIAL DATA
23
22
21
CLOCK
35 LATCHES
LOAD
35-BIT SHIFT
REGISTER
RESET
Note 1: Pin in Data Enable in MM5450
Pin in Output 25 in MM5451
RESET
(only available
1 in die form)
2016 Microchip Technology Inc.
DS20005651A-page 1
1 page  
MM5450/51
TABLE 1-1: ELECTRICAL CHARACTERISTICS
Electrical Characteristics: 4.5V ≤ VDD ≤ 11V, VSS = 0V; TA = 25°C, bold values valid for –40°C ≤ TA ≤ +85°C,
unless otherwise noted.
Parameter
Symbol Min. Typ. Max. Units
Conditions
Power Supply Current
—
—
—
—
—
8.5
10
mA
–25°C to +85°C, excluding output loads
–40°C to +85°C, excluding output loads
Data Input Voltage
VL –0.3 — 0.8
VH 2.2 — VDD V
—
VDD –
2
—
VDD
Logic-0 level, ±10 µA input bias
Logic-1 level, 4.75V ≤ VDD ≤ 5.25V
VDD > 5.25V
Brightness Control Input
Current
—
0 — 0.75 mA
Note 1
— — 10
0 — 10 µA
Segment off, VOUT = 3.0V
Segment on, VOUT = 1.8V, Note 2;
Brightness input = 0 µA
Output Sink Current
—
2.0 2.7
4
Segment on, VOUT = 1.8V, Note 2;
Brightness input = 100 µA
mA
15 — 25
Segment on, VOUT = 1.8V, Note 2;
Brightness input = 750 µA
Brightness Control Input
Voltage
—
3.0 — 4.3 V
Input current = 750 µA
Output Matching
— — — ±20 %
Clock Input Frequency
fC
— — 500 kHz
Clock Input High Time tH 950 — — ns
Clock Input Low Time tL 950 — — ns
Data Input Setup Time
tDS
300 —
—
ns
Data Input Hold Setup
Time
tDH
300 —
—
ns
Note 3, Note 4
Note 5, Note 6
Note 5, Note 6
Note 5, Note 6
—
—
Data Enable Input Setup
Time
tDES
100
—
—
ns
—
Reset Pad Current
— –8 — 8 µA
Die.
Note 1: With a fixed resistor on the brightness input pin, some variation in brightness will occur among devices.
2: See Figure 2-1, Figure 2-2, and Figure 2-3 for recommended operating conditions and limits. Absolute
maximum for each output should be limited to 40 mA.
3: Output matching is calculated as the percent variation of (IMAX + IMIN) / 2.
4: VOUT should be regulated by user. See Figure 2-2 and Figure 2-3 for allowable VOUT vs. IOUT operation.
5: AC input waveform specification for test purpose: tR ≤ 200 ns, tF ≤ 20 ns, f = 500 kHz, 50% ±10% duty
cycle.
6: Clock input rise and fall times must not exceed 300 ns.
2016 Microchip Technology Inc.
DS20005651A-page 5
5 Page 
5.0 PACKAGING INFORMATION
5.1 Package Marking Information
40-Pin PDIP*
XXXXXX
XXXXXXXX
WNNN
44-Pin PLCC*
XXXXXX
XXXXXXXX
WNNN
MM5450/51
Example
MICREL
MM5451YN
6235
Example
MICREL
MM5450YV
8943
Legend:
XX...X
Y
YY
WW
NNN
e3
*
Product code or customer-specific information
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
Pb-free JEDEC® designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator ( e3)
can be found on the outer packaging for this package.
●, ▲, ▼ Pin one index is identified by a dot, delta up, or delta down (triangle
mark).
Note:
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information. Package may or may not include
the corporate logo.
Underbar (_) and/or Overbar (⎯) symbol may not be to scale.
2016 Microchip Technology Inc.
DS20005651A-page 11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet MM5450.PDF ] | |
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